ad8348-eval Analog Devices, Inc., ad8348-eval Datasheet - Page 16

• Manufacturer Part Number: ad8348-eval
• Description: 50 Mhz To 1000 Mhz Quadrature Demodulator
• Manufacturer: Analog Devices, Inc.

AD8348
VGA/DEMODULATOR AND BASEBAND AMPLIFIER
Figure 39. I/Q Amplitude Imbalance vs. F
Figure 38. Quadrature Phase Error vs. F
Figure 37. Quadrature Phase Error vs. F
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
–0.2
–0.4
2.0
1.5
1.0
0.5
2.0
1.5
1.0
0.5
0.4
0.2
0
0
0
0
0
2.7V, 0.7V, +85°C
100
Temperature = −40°C, +25°C, +85°C, F
5V, 0.2V, +25°C
2.7V, 0.2V, –40°C
5V, 0.7V, +25°C
5
5
200
Temperature = −40°C, +25°C, +85°C
2.7V, 0.7V, +25°C
2.7V, 0.7V, –40°C
5V, 0.7V, –40°C
300
10
10
BASEBAND FREQUENCY (MHz)
BASEBAND FREQUENCY (MHz)
2.7V, 0.2V, +85°C
IF FREQUENCY (MHz)
5V, 0.7V, 25°C
400
15
15
500
20
20
BB
BB
IF
600
, VGIN = 0.7 V, V
, VGIN = 0.7 V, V
, Temperature = 25°C, V
25
25
5V, 0.2V, –40°C
5V, 0.2V, +85°C
700
IF
5V, 0.7V, +85°C
2.7V, 0.2V, +25°C
= 380 MHz
30
30
800
POS
POS
35
35
900
= 2.7 V, 5 V,
= 2.7 V, 5 V,
1000
POS
40
40
= 5 V
Rev. A | Page 16 of 28
Figure 40. I/Q Amplitude Imbalance vs. F
300
280
260
240
220
200
180
160
140
120
100
180
Figure 41. Input Impedance of IF Input vs. F
Figure 42. S11 of IF Input vs. F
150
210
–0.5
–1.0
–1.5
–2.0
50
2.0
1.5
1.0
0.5
0
V
POS
150
100
= 5 V (with L Pad, with No Pad, Normalized to 50 Ω)
120
240
250
200
IFIP WITH L PAD
350
300
IF FREQUENCY (MHz)
SHUNT RESISTANCE
SHUNT CAPACITANCE
IF FREQUENCY (MHz)
450
IFIP WITHOUT L PAD
400
IMPEDANCE CIRCLE
IF
, F
90
270
550
500
IF
= 50 MHz to 1 GHz, VGIN = 0.7 V,
IF
650
600
, Temperature = 25°C, V
IF
750
, VGIN = 0.7 V, V
700
850
800
60
300
950
900
POS
30
330
1000
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
POS
= 5 V
0
= 5 V